问题描述

在 lucene 中找出与给定文档匹配的查询中的哪些词的最佳方法是什么?

What is the best way to find out which terms in a query matched against a given document returned as a hit in lucene?

我尝试了一种奇怪的方法，涉及 lucene contrib 中的命中突出显示包，以及一种针对最顶层文档搜索查询中每个单词的方法(docId: xy AND description: each_word_in_query").

I have tried a weird method involving hit highlighting package in lucene contrib and also a method that searches for every word in the query against the top most document ("docId: xy AND description: each_word_in_query").

没有得到满意的结果?命中突出显示不报告与第一个文档以外的文档匹配的某些单词.我不确定第二种方法是否是最佳选择.

Do not get satisfactory results? Hit highlighting does not report some of the words that matched for a document other than the first one. I'm not sure if the second approach is the best alternative.

推荐答案

方法explain 在 Searcher 中是查看查询的哪个部分匹配以及如何匹配的好方法它会影响总分.

The method explain in the Searcher is a nice way to see which part of a query was matched and how it affects the overall score.

示例取自《Lucene In Action 2nd Edition》一书:

Example taken from the book Lucene In Action 2nd Edition:

public class Explainer {

  public static void main(String[] args) throws Exception {

     if (args.length != 2) {
        System.err.println("Usage: Explainer <index dir> <query>");
        System.exit(1);
     }

     String indexDir = args[0];
     String queryExpression = args[1];
     Directory directory = FSDirectory.open(new File(indexDir));
     QueryParser parser = new QueryParser(Version.LUCENE_CURRENT,
                                     "contents", new SimpleAnalyzer());

     Query query = parser.parse(queryExpression);
     System.out.println("Query: " + queryExpression);
     IndexSearcher searcher = new IndexSearcher(directory);
     TopDocs topDocs = searcher.search(query, 10);
     for (int i = 0; i < topDocs.totalHits; i++) {
        ScoreDoc match = topDocs.scoreDocs[i];
        Explanation explanation = searcher.explain(query, match.doc);   
        System.out.println("----------");
        Document doc = searcher.doc(match.doc);
        System.out.println(doc.get("title"));
        System.out.println(explanation.toString());
     }
  }
}

这将解释与查询匹配的每个文档的分数.

This will explain the score of each document that matches the query.

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